Casing-cutter



H. W. BEATTY.

CASING CUTTER.

APPLICATION FILED Aue.22. m9.

Patented Jan. 27, 1920,

rmrrnn STATES PATENT OFFICE.

HARRY W. BEATTY OF OILFIELDS, CALIFORNIA.

CASING-CUTTER.

To all whom it may concern:

Be it known that I, HARRY W. BEATTY, a citizen of the United States, residing at Oilficlds, in the county of Fresno and State of California, have invented certain new and useful Improvements in Casing-Cutters, of which the following is a specification.

This invention relates to well casing cutters and it has for its object the provision of an improved device of this character constructed in such manner that it may be lowered into a well casing to cut off the casing while the latter is in the ground.

Further objects and advantages of the invention will be set forth in the detailed description which now follows:

in the accompanying drawing Figure l is a view, partly in side elevation and partly in section, of a casing cutter constructed in accordance with the invention;

Fig. 2 is a side elevation of a spring guide carried at the lower end of the stru ture;

Fig. 3 is an edge elevation of the structure shown in Fig. 2;

Figs. 1, 5 and 6 are top, front and bottom views of the slips hereinafter described; and

Fig. 7 is an edge elevation of one of said slips.

Like numerals designate corresponding parts throughout the several figures of the drawing.

Referring to the drawing the numeral 5 designates a shank that is threaded at 6 for the reception of a threaded actuating rod by which a reciprocating movement may be imparted to the structure as a whole. The shank 5 carries a hollow body 7 within which a stem 8 is disposed, said stem carrying a head 9 at its lower end and a cap 10 at its upper end. tem 8 carries a collar 11 and a spring 12 bears between this collar and a thimble 13 which rests upon a shoulder 14 upon the sleeve 7. It will thus be seen that the spring tends to thrust the sleeve 7 and the head 9 away from each other and this action tends to retract the cut ters 15, which are pivoted at 16 in the lower portion of the sleeve 7. However, when, as hereinafter set forth, the sleeve 7 and the head 9 are forced together, these cutters 15 are so acted upon by the curved portions 17 of the head 9 that they .are projected out wardly to internally engage the casing to be cut. The structure shown and described Application filed August 22, 1919.

Specification of Letters Patent. Patented J an, 27, 1920,

Serial No. 319,135.

permits the sleeve 7 together with the cut- I To hold the head against movement with.

relation to the casing to thereby form an abutment against whih the teeth 15 may act I provide slips 18, having dovetailed ways 19 formed in their rear faces, which engage with corresponding ways 20 formed upon the head 9. The outer faces of these slips are toothed as indicated 21. A spring guide 22 is carried upon the lower end 0 the stem 23, which stem carries transverse members 24:, the ends 24 of which are disposed in the slots 25 formed in the slips. The spring guide 22 is held upon the stem 23 by means of a spring actuated latch 22*.

During the time that the structure is being lowered into a well casing the slips 21 are retracted, due to the fact that the rod 23 depends freely from the bottom of the structure and holds the slips at the lower end of the inclined ways 20 through the medium of the transverse members 24:. At this time the latch 22, Fig. 3, is not engaged above the lower block 23 of the spring guide 22 but upon the contrary lies above said latch, and the upper blok 23 rests against the lower end of the head 9, so that at thi time the spring guide is being forced downwardly by the thrust of the head 9 leaving the stem 23 free to hold the slips 21 retracted.

When the point is reached at which the cutter is to act to cut off the casing, an upthem outwardly int engagement with the inner side of the casing.

It is to be understood that the invention is not limited to the precise onstruction set forth but that it includes within its purview whatever changes fairly come within either the terms or the spirit of the appended claims.

Having described my invention, What I claim is v 1. A device of the character described comprising a sleeve, pivoted cutters mounted at the lower end of said sleeve, a stem mounted in said sleeve, a head carried by said stem, casing engaging means carried by the head and a cam surface upon the head with which the rear face of the cutters engage and by which the cutters are projected upon relative movement of the parts longitudinally, the sleeve being capable of rotation with relation to the head.

2. A device of the character described comprising a sleeve, pivoted cutters mounted at the lower end of said sleeve, a stem mounted in said sleeve, a head carried by said stem, casing engaging means carried by the head and a cam surface upon the head with which the rear faces of the cutters engage and by which the cutters are projected outwardly upon relative movement of the parts longitudinally, the sleeve being capable of rotation with relation to the head and spring means tending to separate the sleeve and the head.

3. A device of the character described comprising a sleeve, a stem in the sleeve, a head carried by the stem, toothed slips for engaging the interior of a casing to anchor the head to the casing, means for projectingsaid slips and a cam surface upon the head and pivoted cutters carrled by the sleeve the rear faces of which engage and act over said cam surface to be projected thereby, said sleeve and head being capable of rotation with respect to each other.

In testimony whereof I afiix'my signature.

HARRY W. BEATTY.

In the presence of W. J. KILBY, O. W. HUToHEsoNs. 

